I am afraid that using a higher mains voltage will not resolve your problem. Power supplies have a fixed output rating. Increasing the voltage will only result in a smaller current drawn from the mains but a 1000W power supply will still deliver 1000W to the switch. I checked this on CCO and when you look at the specs for the various power supplies, you will see what I mean:
Leo is right. Increasing the input voltage will just lower the current draw on the circuit (Ohm's Law). With a lower input voltage the Power Supply has to work harder to deliver the same power output to the chassis.
To add additional modules to this switch you will need to install a larger set of power supplies.
Thanks Leo and Brad for the good points. Sorry for missing some information about the power supply, the customer have two CAC-2500W power supply, and working in the redundant configuration. when the AC input is 100 to 120VAC, will get 1300W maximum output.
This document will provide screenshots to outline the steps to setup
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